What’s Vulnerable › Vulnerabilities

CVE-2024-46742: smb/server: fix potential null-ptr-deref of lease_ctx_info in smb2_open()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-18 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: smb/server: fix potential null-ptr-deref of lease_ctx_info in smb2_open() null-ptr-deref will occur when (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) and parse_lease_state() return NULL. Fix this by check if 'lease_ctx_info' is NULL. Additionally, remove the redundant parentheses in parse_durable_handle_context().

Affected products

• Linux kernel: before 6.6.51; from 6.7 before 6.10.10; 6.11-rc1, 6.11-rc2, 6.11-rc3, 6.11-rc4 — fixed in 6.10.10, 6.6.51

How to fix

Upgrade to a fixed version: Linux kernel 6.10.10, 6.6.51. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/07f384c5be1f8633b13f0a22616e227570450bc6
• https://git.kernel.org/stable/c/3b692794b81f2ecad69a4adbba687f3836824ada
• https://git.kernel.org/stable/c/4e8771a3666c8f216eefd6bd2fd50121c6c437db
• https://git.kernel.org/stable/c/878f32878351104448b86ef5b85d1f8ed6f599fb
• https://git.kernel.org/stable/c/ec28c35029b7930f31117f9284874b63bea4f31b
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

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